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Stock-Based Compensation (Summary of Restricted Stock Units Activity) (Detail) - Restricted Stock Units - $ / shares
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock Units Outstanding at beginning of period 878,030    
Restricted Stock Units Outstanding, Shares Granted 414,810    
Restricted Stock Units Outstanding, Shares Vested (385,913)    
Restricted Stock Units Outstanding, Shares Forfeited (138,954)    
Restricted Stock Units Outstanding at end of period 767,973 878,030  
Weighted Average Grant Date Fair Value, Nonvested beginning balance $ 34.86    
Weighted Average Grant Date Fair Value, Shares Granted 42.22 $ 49.57 $ 34.67
Weighted Average Grant Date Fair Value, Shares Vested 28.37    
Weighted Average Grant Date Fair Value, Shares Forfeited 41.24    
Weighted Average Grant Date Fair Value, Nonvested ending balance $ 39.42 $ 34.86